package com.nageoffer.shortlink.admin.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import com.alibaba.fastjson2.JSON;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.nageoffer.shortlink.admin.common.convention.exception.ClientException;
import com.nageoffer.shortlink.admin.common.enums.UserErrorCodeEnum;
import com.nageoffer.shortlink.admin.dao.entity.UserDO;
import com.nageoffer.shortlink.admin.dao.mapper.UserMapper;
import com.nageoffer.shortlink.admin.dto.req.UserLoginReqDTO;
import com.nageoffer.shortlink.admin.dto.req.UserRegisterReqDTO;
import com.nageoffer.shortlink.admin.dto.req.UserUpdateReqDTO;
import com.nageoffer.shortlink.admin.dto.resp.UserLoginRespDTO;
import com.nageoffer.shortlink.admin.dto.resp.UserRespDTO;
import com.nageoffer.shortlink.admin.service.GroupService;
import com.nageoffer.shortlink.admin.service.UserService;
import lombok.RequiredArgsConstructor;
import org.redisson.api.RBloomFilter;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.BeanUtils;
import org.springframework.dao.DuplicateKeyException;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

import static com.nageoffer.shortlink.admin.common.constant.RedisCacheConstant.LOCK_USER_REGISTER_KEY;
import static com.nageoffer.shortlink.admin.common.enums.UserErrorCodeEnum.*;

/*
* 用户接口实现层
* */
@Service
@RequiredArgsConstructor
public class UserServiceImpl extends ServiceImpl<UserMapper, UserDO> implements UserService {

    private final RBloomFilter<String> cachePenetrationBloomFilter;
    private final RedissonClient redissonClient;
    private final StringRedisTemplate stringRedisTemplate;
    private final GroupService groupService;
    @Override
    public UserRespDTO getUserByUsername(String username) {
        LambdaQueryWrapper<UserDO> queryWrapper = Wrappers.lambdaQuery(UserDO.class)
                .eq(UserDO::getUsername, username);
        UserDO userDO = baseMapper.selectOne(queryWrapper);
        UserRespDTO result = new UserRespDTO();
        if(userDO == null){
            throw new ClientException(UserErrorCodeEnum.USER_NULL);
        }
        BeanUtils.copyProperties(userDO, result);
        return result;

    }

    @Override
    public Boolean hasUsername(String username) {

        return !cachePenetrationBloomFilter.contains(username);
    }

    @Override
    public void register(UserRegisterReqDTO userRegisterReqDTO) {
        if(!hasUsername(userRegisterReqDTO.getUsername())){
            throw new ClientException(USER_NAME_EXIST);
        }
        RLock lock = redissonClient.getLock(LOCK_USER_REGISTER_KEY + userRegisterReqDTO.getUsername());
        try {
            if (lock.tryLock()){
                try {
                    int insert = baseMapper.insert(BeanUtil.toBean(userRegisterReqDTO, UserDO.class));
                    if (insert<1){
                        throw new ClientException(USER_SAVE_ERROR);
                    }
                }catch (DuplicateKeyException ex){
                    throw new ClientException(USER_EXIST);
                }

                cachePenetrationBloomFilter.add(userRegisterReqDTO.getUsername());
                groupService.saveGroup(userRegisterReqDTO.getUsername(),"默认分组");
                return;
            }
            throw new ClientException("USER_NAME_EXIST");
        }finally {
            lock.unlock();
        }


    }

    @Override
    public void update(UserUpdateReqDTO userUpdateReqDTO) {
        LambdaUpdateWrapper<UserDO> updateWrapper = Wrappers.lambdaUpdate(UserDO.class)
                .eq(UserDO::getUsername, userUpdateReqDTO.getUsername());
        baseMapper.update(BeanUtil.toBean(userUpdateReqDTO,UserDO.class),updateWrapper);
    }

    @Override
    public UserLoginRespDTO login(UserLoginReqDTO userLoginReqDTO) {
        LambdaQueryWrapper<UserDO> queryWrapper = Wrappers.lambdaQuery(UserDO.class)
                .eq(UserDO::getUsername, userLoginReqDTO.getUsername())
                .eq(UserDO::getPassword, userLoginReqDTO.getPassword())
                .eq(UserDO::getDelFlag, 0);
        UserDO userDO = baseMapper.selectOne(queryWrapper);
        if (userDO == null){
            throw new ClientException("用户不存在");
        }
        Map<Object, Object> hasLoginMap = stringRedisTemplate.opsForHash().entries("login_" + userLoginReqDTO.getUsername());
        if (CollUtil.isNotEmpty(hasLoginMap)) {
            String token = hasLoginMap.keySet().stream()
                    .findFirst()
                    .map(Object::toString)
                    .orElseThrow(() -> new ClientException("用户登录错误"));
            return new UserLoginRespDTO(token);
        }
        String uuid = UUID.randomUUID().toString();
        stringRedisTemplate.opsForHash().put("Login_" + userLoginReqDTO.getUsername(),uuid, JSON.toJSONString(userDO));
        stringRedisTemplate.expire("Login_" + userLoginReqDTO.getUsername(),30L, TimeUnit.DAYS);
        return new UserLoginRespDTO(uuid);
    }

    @Override
    public Boolean checkLogin(String username, String token) {
        return stringRedisTemplate.opsForHash().get("Login_"+username,token) != null;

    }

    @Override
    public void logout(String username, String token) {
        if (checkLogin(username,token)){
            stringRedisTemplate.delete("Login_"+username);
            return;
        }
        throw new ClientException("用户Token不存在或用户未登录");
    }
}
